Unmanned aerial vehicle and a landing guidance method using the same

    公开(公告)号:US10191496B2

    公开(公告)日:2019-01-29

    申请号:US15492099

    申请日:2017-04-20

    Abstract: An unmanned aerial vehicle (UAV) is provided. The UAV includes a main body, a plurality of motors connected to the main body, each of the plurality of motors having a rotor blade, a plurality of ultrasonic sensors located at least one of the plurality of motors and the main body, and transmitting and receiving ultrasonic waves to and from a ground surface, and measuring distances from the ground surface, a gyro sensor disposed at the main body and maintaining the UAV in a horizontal state, and a controller disposed at the main body, detecting an unevenness of the ground surface based on the distances from the plurality of ultrasonic sensors to the ground surface, generating a control signal whether to land on the ground surface or not in response to the detection of the unevenness, and transmitting the control signal to the plurality of motors.

    Stock fluctuation prediction method and server

    公开(公告)号:US10185996B2

    公开(公告)日:2019-01-22

    申请号:US15210900

    申请日:2016-07-15

    Abstract: Provided are a method and a system for predicting stock fluctuation prediction. A system for predicting stock fluctuation according to an embodiment of the present invention includes: a data collector and a preprocessor collecting news and KOSPI data and extracting words from the collected news through stopword removal and morphologic analysis, a sentiment dictionary constructor selecting sentiment words and calculating sentiment values of the sentiment words to construct a sentiment dictionary of a stock domain required for stock prediction, and a stock fluctuation prediction model constructor predicting fluctuation of a closing price of a next day to a closing price of a current day by combining a prediction model using the constructed sentiment dictionary and an ARIMA prediction model using the KOSPI data.

    MULTIPLE CHANNEL MEMORY CONTROLLER USING VIRTUAL CHANNEL

    公开(公告)号:US20180253391A1

    公开(公告)日:2018-09-06

    申请号:US15912587

    申请日:2018-03-06

    Inventor: Chan Ho LEE

    CPC classification number: G06F13/1668 G06F3/0613 G06F3/0662 G06F3/0679

    Abstract: A multiple channel memory controller includes: an application adaptor that transfers a command or data received from a host to the outside, and transfers a response associated with the transferred command or data to the host; a plurality of memory adaptors that are respectively connected one-to-one to a plurality of memory devices to form corresponding physical channels; and a virtual channel controller that is located between the application adaptor and the plurality of memory adaptors, and transfers the command or data to at least one physical channel allocated to the virtual channel.

    Charger having battery diagnosis function and method of driving the same

    公开(公告)号:US09958509B2

    公开(公告)日:2018-05-01

    申请号:US15155691

    申请日:2016-05-16

    Abstract: Provided herein is a charger having a battery diagnosis function. The charger is connected between an input power supply supplying an input voltage and a battery and charges the battery with the input voltage. The charger includes a full-bridge-circuit connected to the input power supply and comprising a first switch, a second switch, a third switch, and a fourth switch, a transformer including a primary winding and a secondary winding, wherein the primary winding is connected to the full-bridge-circuit to transform the input voltage received from the full-bridge-circuit and transmits the voltage to the secondary winding, and a rectifying circuit comprising a fifth switch and a sixth switch, connected between the secondary winding and the battery, and rectifying the voltage received from the transformer to charge the battery, or transmitting power in two directions for diagnosing a state-of-health of the battery.

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